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Ok you can't actually calculate it that way... You can measure how many calories you burn... try this site, enter in your weight and how long you exercise for and it will tell you how many calories you burn...
in general calories burned (including cals needed to be alive) > calories taken in = weight loss


![Chillaxin' one day before my b-day trip. in florida of course =]](http://images.funadvice.com/photo/image/old/40774/tiny/CALLIE_S_SWEET_16TH_B-DAY___MARCH_2007__198.jpg)
How much weight can you lose by riding a bike for 1 hour a day?
How much weight can you lose if you ride your bike 1 hour a day?